Merge pull request #1701 from dkouzmanovMSFT/docs-editor/network-protection-1729790149

Include documentation that disables QUIC protocol on browsers

Author: padmagit77

defender-endpoint/network-protection.md

@@ -3,7 +3,7 @@ title: Use network protection to help prevent connections to bad sites
 description: Protect your network by preventing users from accessing known malicious and suspicious network addresses
 ms.service: defender-endpoint
 ms.localizationpriority: medium
-ms.date: 02/28/2024
+ms.date: 10/24/2024
 audience: ITPro
 author: denisebmsft
 ms.author: deniseb
@@ -333,8 +333,8 @@ For Windows Server 2012R2/2016 unified MDE client, Windows Server version 1803 o
    - `Set-MpPreference -AllowNetworkProtectionDownLevel 1`
    - `Set-MpPreference -AllowDatagramProcessingOnWinServer 1`
 
-> [!NOTE]
-> In some cases, depending on your infrastructure, volume of traffic, and other conditions, `Set-MpPreference -AllowDatagramProcessingOnWinServer 1` can have an effect on network performance.
+     > [!NOTE]
+     > In some cases, depending on your infrastructure, volume of traffic, and other conditions, `Set-MpPreference -AllowDatagramProcessingOnWinServer 1` can have an effect on network performance.
 
 ### Network protection for Windows Servers
 
@@ -390,6 +390,9 @@ For Windows Servers and Windows Multi-session, there are additional items that y
 
 Due to the environment where network protection runs, the feature might not be able to detect operating system proxy settings. In some cases, network protection clients are unable to reach the cloud service. To resolve the connectivity problem, [configure a static proxy for Microsoft Defender Antivirus](configure-proxy-internet.md#configure-a-static-proxy-for-microsoft-defender-antivirus).
 
+> [!NOTE]
+> Before starting troubleshooting, make sure to set the QUIC protocol to disabled in browsers that are used. QUIC protocol is not supported with Network Protection functionality.
+
 ## Optimizing network protection performance
 
 Network protection now has a performance optimization that allows Block mode to start asynchronously inspecting long-lived connections, which might provide a performance improvement and can also help with app compatibility problems. This optimization capability is on by default. You can turn off this capability by using the following PowerShell cmdlet: